You might want to clarify what you mean by “light”. If it means light enough for one person to easily lift into a vehicle with the battery removed, that is very difficult to find. I’m in your age group and have looked. When you find one be sure you check the trade-offs I.e. how did they get the weight reduction. Lectric makes one that is sort of light but, in my opinion, has limited power and battery size.
As a side note, finding bike racks to accommodate an ebike is also difficult. Bike weight is the obvious issue.You can find some for smaller bikes that you wheel onto a ramp attached to a trailer hitch. I had one. It was fairly good but I wouldn’t trust it on the highway.
The best option is a cheap trailer if you have a place to keep it. Otherwise uhaul near me will rent an open trailer for $15 per day.
A high quality bike rack will cost you over $300, so the rental might make more sense.
Hope you find what you’re looking for.